Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2014 - zeszyt 2

Determination of the phase composition in commercial Cr-Si-Mn steel after an austempering treatment

nr katalogowy: 84304

In recent years, a lot of research were dedicated to improvement in mechanical and functional properties of steels as the most widely used structural materials. High quantities of expensive alloying elements are usually added to obtain steels with high strength and good plasticity, what considerably raises their price (e.g. maraging steels). Therefore their competitiveness decreased comparing to the other materials. This is why other manufacturing methods are being sought to ensure high strength and good plasticity while maintaining moderate production costs. The production of nanocrystalline structure in the final components is one of the most promising ways of steels development. It was proven, that in steels containing a certain amount of Si, Mn and Cr, the carbidefree nanobainitic structure can be obtained applying a low temperature austempering. Such a structure consists of nanometric ferritic laths separated by thin layers of the retained austenite. Nanobainitic structure leads to high strength, while the appropriate content of retained austenite in form of thin films guarantees good plasticity and fracture toughness. The thin films of austenite forming a percolation structure inhibit the crack propagation, while the blocks of austenite may increase the ductility thanks to the TRIP effect based on the strain induced transformation of austenite into martensite [1÷4]. Thus, a precise determination of volume fractions of the phases in steel and their spatial distribution is essential for a better understanding of the impact of steel phase structure on its mechanical properties. It will also allow to design heat treatment which gives the phase structure ensuring obtainment of the desired properties. In this work, the phase structure in Cr-Si-Mn steel was investigated. A special attention was paid to determine the content of retained austenite after various austempering treatments by means of dilatometric tests and microscopi[...]

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2014-2

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